.todo-box {
    position: absolute;
    width: 540px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #f5f5f5;
  }
  .todo-innerBox {
    position: relative;
    width: 500px;
    margin: 12px auto;
  }
  .todo-add {
    margin-top: 15px;
  }
  .todo-add .todo-btn {
    display: inline-block;
    padding: 6px 13px;
    font-size: 13px;
    font-weight: 400;
    text-align: center;
    cursor: pointer;
    border: 1px solid transparent;
    border-radius: 4px;
    color: #fff;
    background-color: #337ab7;
    border-color: #2e6da4;
  }
  .todo-add .todo-input {
    width: 82%;
    height: 34px;
    padding: 2px 10px;
    margin-right: 10px;
    font-size: 13px;
    color: #555;
    border: 1px solid #ccc;
    border-radius: 4px;
    -webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075);
    box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075);
  }
  .todo-list_li {
    position: relative;
    display: block;
    padding: 10px 15px;
    margin-bottom: -1px;
    background-color: #fff;
    border: 1px solid #ddd;
    font-size: 14px;
  }
  .todo-list_li:first-child {
    border-top-left-radius: 4px;
    border-top-right-radius: 4px;
  }
  .todo-list_li:last-child {
    border-bottom-left-radius: 4px;
    border-bottom-right-radius: 4px;
  }
  .todo-list_li .todo-list_del {
    float: right;
    border: none;
    background: #fff;
    font-size: 12px;
    cursor: pointer;
  }
  .check-box {
    margin-right: 10px;
  }
  .list-group {
    padding-left: 0;
  }
  .todo-tab {
    display: flex;
    width: 100%;
    height: 40px;
    line-height: 40px;
    position: relative;
    margin-bottom: 6px;
  }
  .todo-tab_item {
    flex: 1;
    text-align: center;
  }
  .todo-tab_item a {
    font-size: 14px;
    color: #4d555d;
    text-decoration: none;
  }
  